Abstract
Uptake and utilization of nitrate were investigated in Hordeum vulgare L. cvs Mette and Golf in the vegetative stage, 2 and 4 weeks after sowing. The plants were subjected to a light/dark cycle of 16/8 h (18/12°C). Results obtained with the two genotypes were essentially similar. In the light, xylem nitrate transport and shoot nitrate reduction approximately equalled the amount of nitrate absorbed by the root. A drastic decline in translocation to the shoot in darkness was entirely attributable to decreased transpiration since no major changes in xylem nitrate concentration were observed. Darkening caused only a slight decrease in nitrate uptake, while root nitrate reduction was enhanced. Nitrate starvation for 2 days did not significantlly affect dry matter increment, but resulted in a drastic drop in previously accumulated nitrate, indicating that the stored nitrate is accessible and can sustain unrestricted growth. Uptake increased upon re‐addition of nitrate and after 8 h it was about twice that of non‐starved plants. During recovery, restoration of root nitrate pools and root nitrate reduction took precedence over shoot nitrate accumulation and reduction. Net nitrate uptake and removal of nitrate from the root to the transpiration stream seem to be decisive for the rate of root nitrate reduction.
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Claims 11
Claim · model-written summary
Mette and Golf genotypes gave essentially similar results.
- Taxon
- Hordeum vulgare L.
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Hordeum vulgaree1 - Material
- Mette and Golfe1
- Outcome
- Resultse0
- Direction
- essentially similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Results obtained with the two genotypes were essentially similar.”
e1“Hordeum vulgare L. cvs Mette and Golf”
Claim · model-written summary
In light, xylem nitrate transport and shoot nitrate reduction approximately equaled root nitrate absorption.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Outcome
- xylem nitrate transport and shoot nitrate reductione0
- Direction
- approximately equallede0
- Qualifier
- In the lighte0
- Comparator
- amount of nitrate absorbed by the roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the light, xylem nitrate transport and shoot nitrate reduction approximately equalled the amount of nitrate absorbed by the root.”
e1“Hordeum vulgare L. cvs Mette and Golf”
Claim · model-written summary
Darkness sharply reduced nitrate translocation to shoots through decreased transpiration.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Treatment
- darknesse0
- Outcome
- translocation to the shoote0
- Direction
- drastic declinee0
- Qualifier
- decreased transpiratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A drastic decline in translocation to the shoot in darkness was entirely attributable to decreased transpiration since no major changes in xylem nitrate concentration were observed.”
e1“Hordeum vulgare L. cvs Mette and Golf”
Claim · model-written summary
Xylem nitrate concentration showed no major change in darkness.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Treatment
- darknesse0
- Outcome
- xylem nitrate concentratione0
- Direction
- no major changese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A drastic decline in translocation to the shoot in darkness was entirely attributable to decreased transpiration since no major changes in xylem nitrate concentration were observed.”
e1“Hordeum vulgare L. cvs Mette and Golf”
Claim · model-written summary
Darkening slightly decreased nitrate uptake.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Treatment
- Darkeninge0
- Outcome
- nitrate uptakee0
- Direction
- slight decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Darkening caused only a slight decrease in nitrate uptake, while root nitrate reduction was enhanced.”
e1“Hordeum vulgare L. cvs Mette and Golf”
Claim · model-written summary
Darkening enhanced root nitrate reduction.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Treatment
- Darkeninge0
- Outcome
- root nitrate reductione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Darkening caused only a slight decrease in nitrate uptake, while root nitrate reduction was enhanced.”
e1“Hordeum vulgare L. cvs Mette and Golf”
Claim · model-written summary
Two days of nitrate starvation did not significantly affect dry matter increment.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Treatment
- Nitrate starvation for 2 dayse0
- Outcome
- dry matter incremente0
- Direction
- did not significantlly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate starvation for 2 days did not significantlly affect dry matter increment”
e1“Hordeum vulgare L. cvs Mette and Golf”
Claim · model-written summary
Nitrate starvation sharply depleted previously accumulated nitrate.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Treatment
- Nitrate starvation for 2 dayse2
- Outcome
- previously accumulated nitratee0
- Direction
- drastic drope0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulted in a drastic drop in previously accumulated nitrate”
e1“Hordeum vulgare L. cvs Mette and Golf”
e2“Nitrate starvation for 2 days”
Claim · model-written summary
After nitrate readdition, uptake doubled relative to non-starved plants at eight hours.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Treatment
- re‐addition of nitratee0
- Outcome
- Uptakee0
- Direction
- increasede0
- Value
- about twicee0
- Qualifier
- after 8 he0
- Comparator
- non‐starved plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Uptake increased upon re‐addition of nitrate and after 8 h it was about twice that of non‐starved plants.”
e1“Hordeum vulgare L. cvs Mette and Golf”
Claim · model-written summary
During recovery, root nitrate pool restoration and root reduction preceded shoot accumulation and reduction.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Outcome
- restoration of root nitrate pools and root nitrate reductione0
- Direction
- took precedencee0
- Qualifier
- During recoverye0
- Comparator
- shoot nitrate accumulation and reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During recovery, restoration of root nitrate pools and root nitrate reduction took precedence over shoot nitrate accumulation and reduction.”
e1“Hordeum vulgare L. cvs Mette and Golf”
Claim · model-written summary
Net uptake and nitrate removal to the transpiration stream appear decisive for root nitrate reduction rate.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree1
- Outcome
- rate of root nitrate reductione0
- Qualifier
- Net nitrate uptake and removal of nitrate from the root to the transpiration streame0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net nitrate uptake and removal of nitrate from the root to the transpiration stream seem to be decisive for the rate of root nitrate reduction.”
e1“Hordeum vulgare L. cvs Mette and Golf”
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See all 9 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.